Porn Valley- A NAKED look-alike [pictured left] of supermodel Tyra Banks posing on the cover of porno magazine Xtreme is causing a lot of double takes at seamy newsstands. And the September cover headline, “Totally Tyra,” isn’t helping the confusion.

The singularly named model – who was “discovered” by a porn director at a shopping mall and stars in the just-released “Boned” – says in the Xtreme interview that she’s had no legal hassles posing as “Tyra.”

“I haven’t met her; I haven’t heard anything from her,” she says. “I’m not sure she’s heard about me!” The brazen wannabe even set up a Web site, totallytyra.com.

“Imitation is the sincerest form of flattery,” Cindi Berger, Banks’ spokeswoman, tells PAGE SIX. Looking at a copy of the “Tyra” cover, she said, “Clearly, this is not Tyra. Tyra doesn’t smoke or drink, and she wouldn’t pose nude in a million years.”

“The Tyra Banks Show,” the “America’s Next Top Model” host’s new WB talk show, debuts today. The other Tyra can next be seen in the porn video “That’s Hot.” “It’s a Paris Hilton thing,” she tells Xtreme.